minor x86-64 boot-options.txt update

Minor documentation update. If we need to tell users that
nmi_watchdog=2 claims one performance counter, we should
tell them that the local APIC LVTPC vector is claimed too.

/Mikael

--- linux-2.4.22-pre3/Documentation/x86_64/boot-options.txt.~1~	2003-07-06 18:37:42.000000000 +0200
+++ linux-2.4.22-pre3/Documentation/x86_64/boot-options.txt	2003-07-06 19:21:06.000000000 +0200
@@ -65,7 +65,8 @@
   0 don't use an NMI watchdog
   1 use the IO-APIC timer for the NMI watchdog
   2 use the local APIC for the NMI watchdog using a performance counter. Note
-  This will use one performance counter.
+  This will use one performance counter and the local APIC's performance
+  counter vector.
 
 Idle loop
 
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